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Pronounced northward shift of the westerlies during MIS 17 leading to the strong 100-kyr ice age cycles

2019-04Journal article Restricted access
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dc.contributor.authorGoni, Maria Fernanda Sanchez
dc.contributor.authorFerretti, Patrizia
dc.contributor.authorPolanco-Martinez, Josue M.
dc.contributor.authorRodrigues, Teresa
dc.contributor.authorAlonso-Garcia, Montserrat
dc.contributor.authorJavier Rodriguez-Tovar, Francisco
dc.contributor.authorDorador, Javier
dc.contributor.authorDesprat, Stephanie
dc.date.accessioned2020-07-24T10:52:37Z
dc.date.available2020-07-24T10:52:37Z
dc.date.issued2019-04
dc.description.abstractThe MIS 17 interglacial, similar to 715-675 ka, marks the end of the Mid-Pleistocene Transition as intensified, long and asymmetrical 100-kyr ice age cycles became eminently established. Increasing arrival of moisture to the Northern Hemisphere high latitudes, resulting from the northwestward migration of the Subpolar Front and the intensification of the Norwegian Greenland Seas (NGS) convection, has been put forward to explain the emergence of this quasi-periodic 100-kyr cycle. However, testing this hypothesis is problematic with the available North Atlantic precipitation data. Here we present new pollen-based quantitative seasonal climate reconstructions from the southwestern Iberian margin that track changes in the position and intensity of the westerlies. Our data compared to changes in North Atlantic deep and surface water conditions show that MIS 17 interglacial was marked by three major changes in the direction and strength of the westerlies tightly linked to oceanographic changes. In particular, we report here for the first time a drastic two-steps northward shift of the westerlies centered at similar to 693 ka that ended up with the sustained precipitation over southern European. This atmospheric reorganization was associated with northwestward migration of the Subpolar Front, strengthening of the NGS deep water formation and cooling of the western North Atlantic region. This finding points to the substantial arrival of moisture to the Northern Hemisphere high latitudes at the time of the decrease in summer energy and insolation contributing to the establishment of strong 100-kyr cycles. (C) 2019 Elsevier B.V. All rights reserved.
dc.description.sponsorshipBasque GovernmentBasque Government [POS_2015_1_0006]
dc.description.sponsorshipFCTPortuguese Foundation for Science and Technology [PTDC/MAR-PRO/3396/2014, UID/Multi/04326/2013, SFRH/BPD/96960/2013, SFRH/BPD/108600/2015]
dc.identifier.doi10.1016/j.epsl.2019.01.032
dc.identifier.issn0012-821X
dc.identifier.issn1385-013X
dc.identifier.urihttp://hdl.handle.net/10400.1/14385
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier Science
dc.subjectU1385 Shackleton Site
dc.subjectMidpleistocene revolution
dc.subjectClimate variability
dc.subjectOcean circulation
dc.subjectIberian margin
dc.subjectStorm tracks
dc.subjectAtlantic
dc.subjectVegetation
dc.subjectPollen
dc.subjectPrecession
dc.titlePronounced northward shift of the westerlies during MIS 17 leading to the strong 100-kyr ice age cycles
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMulti%2F04326%2F2013/PT
oaire.citation.endPage129
oaire.citation.startPage117
oaire.citation.titleEarth and Planetary Science Letters
oaire.citation.volume511
oaire.fundingStream5876
person.familyNameRodrigues
person.familyNameAlonso-Garcia
person.givenNameTeresa
person.givenNameMontserrat
person.identifier.ciencia-idEC18-2390-9594
person.identifier.ciencia-id5B1B-33EE-50B9
person.identifier.orcid0000-0001-7811-7506
person.identifier.orcid0000-0002-0241-2178
person.identifier.ridG-2912-2013
person.identifier.scopus-author-id7004330274
person.identifier.scopus-author-id51565655800
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
rcaap.typearticle
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relation.isAuthorOfPublication7772f374-a9c2-41e7-a798-4d811b8a9a48
relation.isAuthorOfPublication.latestForDiscovery0a137e49-be7a-4e12-85e2-3def90980f7e
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